Patents by Inventor Robert C. U. Yu

Robert C. U. Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8361685
    Abstract: The disclosed embodiments are directed to processes for removing photoreceptor coatings from a substrate, wherein the photoreceptor coatings disposed over a substrate of an electrophotographic photoreceptor. More specifically, the present embodiments discloses a photoreceptor coatings removal process comprises subjecting an electrophotographic photoreceptor to a stripping solution that separates the coatings from the substrate.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: January 29, 2013
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Kent J. Evans, Yuhua Tong, Nancy L. Belknap, Helen R. Cherniack, Robert P. Altavela, Edward F. Grabowski
  • Patent number: 8343700
    Abstract: The presently disclosed embodiments relate in general to electrostatography comprising improved features in the flexible imaging member that enhance function when used in the electrostatographic imaging system. These embodiments pertain, more particularly, to a structurally simplified curl-free flexible electrostatographic imaging member belt containing a stress/strain free ground strip layer and stress/strain free imaging layer(s) to improve dynamic belt cyclic motion quality and extend service life.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: January 1, 2013
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Yuhua Tong, Michael S. Roetker, Jimmy E. Kelly, Kyle B. Tallman
  • Patent number: 8304151
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the incorporation of an ozone quenching compound into the charge transport layer to quench the corona effluents and protect the polycarbonate binder of the charge transport layer from being attacked by ozone species, thereby enhancing wear resistance and fatigue cracking.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: November 6, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Jimmy E. Kelly
  • Patent number: 8278017
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the development of a structurally simplified flexible electrophotographic imaging member without the need of an anticurl back coating layer and a post treatment process for effecting the imaging member service life extension in the field.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: October 2, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Michael S. Roetker
  • Publication number: 20120237862
    Abstract: Embodiments provide novel imaging members used in electrostatography. More particularly, there is provided flexible electrophotographic imaging members which exhibit an extended functional life. These imaging members include an improved protective overcoat layer comprising: (1) a polymer blend of a low surface energy copolymer and a chemically resistive copolymer, (2) a chemically resistive copolymer and a slip agent, and (3) a chemically resistive copolymer and the dispersion of a low surface energy Polyhedral Oligomeric Silsesquioxane (POSS) nanoparticles to effect surface contact friction reduction for enhancing wear resistance and for suppressing copy printout defect caused by chemical attack.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 20, 2012
    Applicant: XEROX CORPORATION
    Inventor: Robert C. U. Yu
  • Patent number: 8263301
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: September 11, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Kathleen M. Carmichael
  • Patent number: 8263298
    Abstract: Embodiments provide novel imaging members used in electrostatography. More particularly, there is provided flexible electrophotographic imaging members which have improved imaging layer(s) formulated to comprise of a plasticizer in a material matrix of a solid solution comprising a charge transporting compound and a film forming polymer binder which is a novel A-B diblock copolymer or a binary polymer blend of a novel A-B diblock copolymer and a bisphenol polycarbonate. The flexible imaging members thus prepared have improved photoelectrical cyclic function stability, chemical resistive property, and are curl-free, and thus eliminate the need for an additional anticurl back coating layer.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: September 11, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Jimmy E. Kelly
  • Publication number: 20120219893
    Abstract: Embodiments provide novel imaging members used in electrostatography. More particularly, there is provided flexible electrophotographic imaging members which have improved imaging layer(s) formulated to comprise of a plasticizer in a material matrix of a solid solution comprising a charge transporting compound and a film forming polymer binder which is a novel A-B diblock copolymer or a binary polymer blend of a novel A-B diblock copolymer and a bisphenol polycarbonate. The flexible imaging members thus prepared have improved photoelectrical cyclic function stability, chemical resistive property, and are curl-free, and thus eliminate the need for an additional anticurl back coating layer.
    Type: Application
    Filed: February 24, 2011
    Publication date: August 30, 2012
    Applicant: XEROX CORPORATION
    Inventors: Robert C.U. Yu, Stephen T. Avery, Jimmy E. Kelly
  • Patent number: 8241825
    Abstract: Embodiments pertain to a flexible imaging member used in electrostatography and processes for making and using the imaging member. More particularly, the embodiments pertain to a structurally simplified flexible electrophotographic imaging member that has reasonable flatness and exhibits good performance without the need of an anticurl back coating layer.
    Type: Grant
    Filed: August 31, 2009
    Date of Patent: August 14, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery, Michael S. Roetker, Jimmy E. Kelly
  • Patent number: 8232030
    Abstract: Present embodiments are directed to the improvement of flexible imaging members used in electrophotography. More particularly, embodiments pertain to a structurally simplified curl-free flexible electrophotographic imaging member without the need for an anticurl back coating, having a functionally improved top outermost exposed slippery imaging layer which furthers extends service life, and provides a process for making and using the member.
    Type: Grant
    Filed: March 17, 2010
    Date of Patent: July 31, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Yuhua Tong, Stephen T. Avery
  • Patent number: 8232032
    Abstract: Present embodiments pertain to an improved electrostatographic imaging member having low contact friction surfaces to ease sliding mechanical interaction and suppressing abrasion/wear failure and methods of preparing thereof. The improved imaging member has layers comprising one or two low surface energy polymeric materials that enhance the physical and mechanical functions and reduce the layers surface contact friction of the imaging member to extend service life.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: July 31, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Edward F. Grabowski, Kathleen M. Carmichael, Stephen T. Avery, Satish Parikh
  • Patent number: 8211601
    Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrostatographic, including digital, apparatuses. More particularly, the embodiments pertain to an improved electrostatographic imaging member incorporating a thermoplastic material pre-compounded to impart conductivity to the anti-curl back coating layer and may also contain an adhesion promoter which provides a conductively and optically anti-curl back coating layer. The conductive anti-curl back coating of the present disclosure may be formulated to have a single layer, dual layers, or triple layers.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: July 3, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Yuhua Tong, Edward F. Grabowski, Kock-Yee Law
  • Patent number: 8173341
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the incorporation of a liquid compound having a high boiling point into the charge transport layer such that an anticurl back coating is no longer needed for reduction or elimination of photoreceptor layer curling.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: May 8, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Yuhua Tong
  • Patent number: 8168356
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the incorporation of a liquid compound having a high boiling point into the charge transport layer such that an anticurl back coating is no longer needed for reduction or elimination of photoreceptor upward curling.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: May 1, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Yuhua Tong, Michael Roetker, Edward F. Grabowski, Jimmy E. Kelly
  • Patent number: 8163449
    Abstract: The presently disclosed embodiments relate generally to the formulation of an anticurl back coating layer that renders imaging apparatus flexible members and components their desirable flatness, for use in electrostatographic, including digital apparatuses. More particularly, the embodiments pertain to an imaging member comprising an anticurl back coating layer formulated to comprise a polymer blend of an anti-static polymer and a low surface energy A-B diblock copolymer polymer and an adhesion promoter. The embodiments provide an imaging member belt with the anticurl back coating that is electrically conductive and also substantially reduces its surface contact friction to help suppress/eliminate tribo-electrical charge build-up at the backside of the imaging member belt under normal machine imaging member belt operational conditions in the field.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: April 24, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Edward F. Grabowski, Yuhua Tong
  • Patent number: 8142967
    Abstract: The presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrostatographic, including digital, apparatuses. More particularly, the embodiments pertain to an improved electrostatographic imaging member incorporating a carbon nano tube dispersion into a high molecular weight polycarbonate and an anti-static copolymer with polyester, polycarbonate, and polyethylene glycol units in a formulation for the anti-curl back coating layer which provides a conductively suitable and stable dispersion coating solution for making an optically suitable anti-curl back coating layer.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: March 27, 2012
    Assignee: Xerox Corporation
    Inventors: Yuhua Tong, Edward F. Grabowski, Donald J. Goodman, Kock-Yee Law, Robert C. U. Yu
  • Patent number: 8124305
    Abstract: The presently disclosed embodiments relate in general to electrophotographic imaging members, such as layered photoreceptor structures, and processes for making and using the same. More particularly, the embodiments pertain to the incorporation of a liquid compound having a high boiling point into the charge transport layer such that an anticurl back coating is no longer needed for reduction or elimination of photoreceptor layer curling.
    Type: Grant
    Filed: May 1, 2009
    Date of Patent: February 28, 2012
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Stephen T. Avery, Edward F. Grabowski, Terry L. Street, Jimmy E. Kelly, Joellen Simone
  • Publication number: 20120045715
    Abstract: The presently disclosed embodiments relate generally to the formulation of an anticurl back coating layer that renders imaging apparatus flexible members and components their desirable flatness, for use in electrostatographic, including digital apparatuses. More particularly, the embodiments pertain to an imaging member comprising an anticurl back coating layer formulated to comprise conductive carbon nanotubes dispersion in a polymer blend comprising three film-forming thermoplastic polymers to: (a) render electrical conductivity effect for tribo-electrical charge elimination (b) impart static dissipation capability, and (c) provide surface energy lowering effect for contact friction reduction to ease imaging member belt drive as well as cutting tribo-electrical charge build-up under normal imaging member belt operational conditions in the field.
    Type: Application
    Filed: August 18, 2010
    Publication date: February 23, 2012
    Applicant: XEROX CORPORATION
    Inventors: Edward F. Grabowski, Robert C. U. Yu, Kock-Yee Law, Yuhua Tong
  • Publication number: 20120034555
    Abstract: The presently disclosed embodiments relate generally to the formulation of an anticurl back coating layer that renders imaging apparatus flexible members and components their desirable flatness, for use in electrostatographic, including digital apparatuses. More particularly, the embodiments pertain to an imaging member comprising an anticurl back coating layer formulated to comprise a polymer blend of an anti-static polymer and a low surface energy A-B diblock copolymer polymer and an adhesion promoter. The embodiments provide an imaging member belt with the anticurl back coating that is electrically conductive and also substantially reduces its surface contact friction to help suppress/eliminate tribo-electrical charge build-up at the backside of the imaging member belt under normal machine imaging member belt operational conditions in the field.
    Type: Application
    Filed: August 5, 2010
    Publication date: February 9, 2012
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Edward F. Grabowski, Yuhua Tong
  • Publication number: 20120003575
    Abstract: The presently disclosed embodiments are directed to imaging members used in electrostatography. More particularly, the embodiments pertain to electrophotographic imaging members which have an added-on protective overcoat layer formulated to comprise of a novel A-B diblock copolymer comprising two segmental blocks of a bisphenol polycarbonate and an organic acid terminal which provides chemical vapor contaminant resistive property. The overcoat layer may further be formulated to include small quantity of charge transport compound. The present embodiments provide superior copy printout quality.
    Type: Application
    Filed: June 30, 2010
    Publication date: January 5, 2012
    Applicant: XEROX CORPORATION
    Inventors: Robert C. U. Yu, Yuhua Tong